├── .gitignore ├── LICENSE ├── README.md ├── README.rlm_rest.md ├── dictionary ├── main.pm ├── module └── policy /.gitignore: -------------------------------------------------------------------------------- 1 | .* 2 | !.gitignore 3 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published by 637 | the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | This page describes how to set up [FreeRADIUS](https://freeradius.org/) using [`rlm_perl`](https://freeradius.org/modules/?s=perl&mod=rlm_perl) to communicate with an [OAuth2](https://oauth.net/2/) identity provider backend allowing users to connect to a wireless [802.1X](https://en.wikipedia.org/wiki/IEEE_802.1X) (WPA Enterprise) network without needing on premise systems. 2 | 3 | Your OAuth2 provider *must* support the [Resource Owner Password Credentials Grant](https://tools.ietf.org/html/rfc6749#section-4.3); this means (for now) only [Microsoft Azure Active Directory](https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth-ropc) is supported. The [Password Grant](https://oauth.net/2/grant-types/password/) is necessary as it is the only grant flows that does not require user interaction with a web browser (think "log in via Google/Facebook/LinkedIn/...") which is impossible during an 802.1X authentication as the user's workstation does not have an IP address. 4 | 5 | For 802.1X (wired and WPA Enterprise wireless) authentication, you *must* use [EAP-TTLS/PAP](https://en.wikipedia.org/wiki/Extensible_Authentication_Protocol#EAP_Tunneled_Transport_Layer_Security_(EAP-TTLS)) so that the cleartext password is securely transported to your RADIUS server and usable with the password grant flow. Fortunately client support is widespread and so Linux, Android, BB10, macOS/iOS (via a [`.mobileconfig`](https://support.apple.com/apple-configurator)) and [Microsoft Windows 8](https://adamsync.wordpress.com/2012/05/08/eap-ttls-on-windows-2012-build-8250/) or later (use a supplicant extension such as [SecureW2 Enterprise Client](https://www.securew2.com/products/enterpriseclient/) for earlier versions) users will have have no problems. Ignore the [FUD](https://en.wikipedia.org/wiki/Fear,_uncertainty,_and_doubt) around EAP-TTLS/PAP which in practice works *identically* to how web browsers transmit credentials over HTTPS ([PEAP/MSCHAPv2 is similarly vulnerable](https://github.com/tehrhart/challenger)); like HTTPS though you *must* use a [valid certificate *and* configure your clients to verify the server name](https://wiki.geant.org/display/H2eduroam/How+to+support+to+end+users#Howtosupporttoendusers-ParametersforSecureDeviceConfiguration) for it to be safe. 6 | 7 | **N.B.** this will not work with [MFA enabled accounts](https://docs.microsoft.com/en-us/azure/active-directory/authentication/concept-mfa-howitworks) but you can workaround this with a [conditional access policy](https://github.com/jimdigriz/freeradius-oauth2-perl/issues/12) 8 | 9 | ## Features 10 | 11 | Many of these features aim to try to *not* communicate with Azure so to hide both latency and throttling problems. 12 | 13 | * updates user/group information in the background and does not delay authentications 14 | * by default this refresh occurs every 30 seconds (using the `ttl` configuration parameter in [`module`](module)) 15 | * do not go below 30 in production, as delays in the cloud make lower values mostly pointless 16 | * smallest value allowed is 10 but going below the default should only be used if you are debugging the database replication code 17 | * if you require 'instant' replication then [webhooks is the answer](https://github.com/jimdigriz/freeradius-oauth2-perl/issues/9) 18 | * [supports paging](https://docs.microsoft.com/en-us/graph/paging) 19 | * earlier versions of this code were limited to 999 user accounts 20 | * [supports delta queries](https://docs.microsoft.com/en-us/graph/delta-query-overview) 21 | * reduces amount of data needing to be transferred from Azure 22 | * means faster polling for updates can be used without triggering throttling 23 | * connection cache to Azure to make requests faster 24 | * password caching (protected with a [`{ssha512}`](https://freeradius.org/radiusd/man/rlm_pap.html) salted hash) 25 | * user list is still checked so the effect of disabling an account will continue to be fast 26 | * if a user updates their password, the cached entry is ignored 27 | * group membership is populated by way of the `OAuth2-Group` attribute and optionally checked by using [unlang](https://freeradius.org/radiusd/man/unlang.html) 28 | 29 | ## Support 30 | 31 | These instructions assume you are familiar with using FreeRADIUS in an 802.1X environment and if you are not you should [start with a EAP-TTLS/PAP 802.1X deployment using static credentials](https://openschoolsolutions.org/freeradius-secure-wifi-network/) stored in a [local `users` file](https://wiki.freeradius.org/config/Users). 32 | 33 | If you run into problems getting a `users` file environment to run, then please seek support from the [FreeRADIUS community](https://freeradius.org/support/) but do *not* ask there for help on how to use this module. 34 | 35 | Once you are more familiar with using FreeRADIUS and have the above working, then you should try to follow these instructions. If you run into problems then do seek non-guaranteed 'best effort' help from me through a GitHub issue including the *full* and *complete* output of `freeradius -X | tee /tmp/radiusd.log` with any client secrets, `User-Password` and `Bearer` values obscured. Do *not* send truncated output, or the output *you* think is important, if you do, it is likely your issue will be closed. 36 | 37 | If you do open a GitHub issue you *must* be either using the [packaging from Network RADIUS (process described below)](https://networkradius.com/freeradius-packages/index.html) or have compiled from source the [`v3.2.x` branch](https://github.com/FreeRADIUS/freeradius-server/tree/v3.2.x) (or [`v3.0.x` branch](https://github.com/FreeRADIUS/freeradius-server/tree/v3.0.x)). If you do not do this, for example instead use your distribution's (Redhat, Ubuntu, ...) packaging, your issue is likely to be closed as I am unable to provide Pro Bono consultancy for your organisation. 38 | 39 | This project is a volunteer backed effort and the volunteer (ie. me) requests when asking for *free* assistance you use a supported environment. This is a reasonable request. 40 | 41 | Consultancy services are available through [coreMem Limited](https://coremem.com/). 42 | 43 | # Preflight 44 | 45 | On the target RADIUS server, as `root` fetch a copy of the project, the recommended approach is to use [`git`](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git) with: 46 | 47 | cd /opt 48 | git clone https://github.com/jimdigriz/freeradius-oauth2-perl.git 49 | cd freeradius-oauth2-perl 50 | 51 | **N.B.** alternatively open the URL above in your browser, click on 'Clone or download' and use the 'Download ZIP' 52 | 53 | You now need to install FreeRADIUS 3.2.x as your target, and it is *strongly* recommended you use the [packages distributed by Network RADIUS](https://networkradius.com/freeradius-packages/index.html). 54 | 55 | How to use Debian is described below, but the instructions should be adaptable with ease to Ubuntu and with not too much work for CentOS. Pull requests are welcomed from those who worked out how to get this working on other OS's (eg. \*BSD, another Linux, macOS, ...) and/or a later version of FreeRADIUS. 56 | 57 | ### Debian/Ubuntu 58 | 59 | Starting with a fresh empty Debian 'bookworm' 12.x (or Ubuntu 'jammy' 22.04) or later installation, as `root` run the following: 60 | 61 | apt-get update 62 | apt-get -y install --no-install-recommends ca-certificates curl libjson-pp-perl libwww-perl 63 | 64 | Now follow the instructions at the [FreeRADIUS Packages](https://networkradius.com/packages/#fr30) site to install their release of FreeRADIUS. 65 | 66 | You should now have a working FreeRADIUS 3.2.x installation but to verify you have done this step correctly, please run the following: 67 | 68 | dpkg-query --showformat '${Maintainer}\n' -W freeradius 69 | Network RADIUS SARL 70 | 71 | Confirm the output states "Network RADIUS SARL", if it lists "Debian" (or "Ubuntu") then you need to recheck what you did as it was incorrect. 72 | 73 | **N.B.** these instructions were tested using `docker run -it --rm -v $(pwd):/opt/freeradius-oauth2-perl debian:bookworm` (and on `ubuntu:jammy`) with FreeRADIUS 3.2.3, so your numbering may be different! 74 | 75 | It is *strongly* recommended at this point you create a backup of the original configuration: 76 | 77 | cp -a /etc/freeradius /etc/freeradius.orig 78 | 79 | This will let you to track the changes you made using: 80 | 81 | diff -u -N -r /etc/freeradius.orig /etc/freeradius 82 | 83 | **N.B.** if your configuration shows to have a `3.2` (or `3.0`) directory in `/etc/freeradius` then you have *not* correctly followed the instructions above so recheck! 84 | 85 | # Configuration 86 | 87 | ## Microsoft Azure AD (Office 365) 88 | 89 | 1. Log into your Microsoft Azure account as an administrator 90 | 1. open the 'Azure Active Directory' service 91 | 1. under 'Manage' in the left hand panel, go to 'App registrations' and select 'New registration' 92 | 1. use the following settings and then click on 'Register': 93 | * **Name:** `freeradius-oauth2-perl` 94 | * **Supported account types:** Accounts in this organizational directory only - (Single tenant) 95 | * **Redirect URI (optional):** [blank] 96 | 1. make a note of the 'Client ID' for later 97 | 1. for your new application, go to 'Certificates & secrets' and click on 'New client secret' 98 | * it is recommended for the description you use the server name of your RADIUS server 99 | * if you set an expiry, remember to set a reminder in your calendar! 100 | 1. make a note of the newly created 'Client secret' (you will not be able to retrieve it later!) 101 | 1. for your new application, go to 'API permissions' 102 | 1. click on 'Add a permission' 103 | 1. go to the 'Microsoft APIs' tab 104 | 1. select 'Microsoft Graph' 105 | 1. select 'Application permissions' 106 | 1. check `Directory.Read.All` 107 | 1. click on 'Add permissions' 108 | 1. `User.Read` should be an already present 'Delegated' permission type 109 | 1. click on the 'Grant admin consent' button (you will receive an email notification that you have done this) 110 | 111 | ## FreeRADIUS 112 | 113 | After updating the following files as described below (you may need to replace `freeradius` with `raddb`), you should restart FreeRADIUS (`sudo systemctl restart freeradius`) to apply the changes. 114 | 115 | Add the following to `/etc/freeradius/proxy.conf`: 116 | 117 | realm example.com { 118 | oauth2 { 119 | discovery = "https://login.microsoftonline.com/%{Realm}/v2.0" 120 | client_id = "..." 121 | client_secret = "..." 122 | cache_password = yes 123 | } 124 | } 125 | 126 | Replacing `example.com` with your domain and `oauth2_client_{id,secret}` with the noted values from earlier and if you maintain multiple domains you should add multiple blocks here too. 127 | 128 | **N.B.** do *not* use regular expression to capture your `realm`, you *must* create an entry for each and every (sub-)domain you intend to use 129 | 130 | If local policy requires you to disable password caching then you can set `cache_password = no` (default: `yes`, *anything* else is treated as `no`) but it is strongly recommended this is enabled as it improves user-experience and provides protection from potential service outages if Azure decides to throttle you. 131 | 132 | Run the following as root: 133 | 134 | printf '\n$INCLUDE /opt/freeradius-oauth2-perl/dictionary\n' >> /etc/freeradius/dictionary 135 | ln -s /opt/freeradius-oauth2-perl/module /etc/freeradius/mods-enabled/oauth2 136 | ln -s /opt/freeradius-oauth2-perl/policy /etc/freeradius/policy.d/oauth2 137 | 138 | Edit your `/etc/freeradius/sites-enabled/default`: 139 | 140 | * in the `authorize` section add `oauth2` after `ldap` but before the commented `daily` module 141 | * *must* be before the call to `pap` for the password caching functionality to work 142 | * at the end of the `authenticate` section add the `Auth-Type oauth2` stanza with `oauth2` inside 143 | * in the `post-auth` section add `oauth2` after the commented out `ldap` but before the `exec` module 144 | 145 | **N.B.** start with the stock/upstream packaged [`default`](https://github.com/FreeRADIUS/freeradius-server/blob/v3.2.x/raddb/sites-available/default) and *add* to it, do *not* strip or change anything until you have a working configuration. Once you have a working configuration then do explore customising it to fit your needs but if you break something this module will return `invalid` (ie. dependency on the [`suffix` module setting the `Realm` attribute](https://freeradius.org/modules/?s=realm&mod=rlm_realm)) 146 | 147 | This should look something like: 148 | 149 | authorize { 150 | ... 151 | 152 | -ldap 153 | 154 | oauth2 155 | #if (updated) { 156 | # 157 | # # uncomment to enforce the group membership 'network-users' 158 | # if (!(&OAuth2-Group && &OAuth2-Group[*] == "network-users")) { 159 | # reject 160 | # } 161 | # 162 | # # uncomment to use group membership for VLAN assignment 163 | # update { 164 | # Tunnel-Type := VLAN 165 | # Tunnel-Medium-Type := IEEE-802 166 | # Tunnel-Private-Group-ID := 11 167 | # } 168 | # if (&OAuth2-Group) { 169 | # if (&OAuth2-Group[*] == "staff") { 170 | # update { 171 | # Tunnel-Private-Group-ID := 13 172 | # } 173 | # } elsif (&OAuth2-Group[*] == "students") { 174 | # update { 175 | # Tunnel-Private-Group-ID := 15 176 | # } 177 | # } else { 178 | # update { 179 | # Tunnel-Private-Group-ID := 17 180 | # } 181 | # } 182 | # } 183 | # 184 | #} 185 | 186 | #daily 187 | 188 | ... 189 | } 190 | 191 | ... 192 | 193 | authenticate { 194 | ... 195 | 196 | # Auth-Type eap { 197 | # ... 198 | # } 199 | 200 | Auth-Type oauth2 { 201 | oauth2 202 | } 203 | } 204 | 205 | post-auth { 206 | ... 207 | 208 | #ldap 209 | 210 | oauth2 211 | 212 | exec 213 | 214 | ... 215 | } 216 | 217 | ### 802.1X 218 | 219 | You should edit your `/etc/freeradius/sites-enabled/inner-tunnel` file similarly to how you amended `/etc/freeradius/sites-enabled/default` above. 220 | 221 | **N.B.** start with the stock/upstream packaged [`inner-tunnel`](https://github.com/FreeRADIUS/freeradius-server/blob/v3.2.x/raddb/sites-available/inner-tunnel) and *add* to it, do *not* strip or change anything until you have a working configuration. Once you have a working configuration then do explore customising it to fit your needs but if you break something this module will return `invalid` (ie. dependency on the [`suffix` module setting the `Realm` attribute](https://freeradius.org/modules/?s=realm&mod=rlm_realm)) 222 | 223 | #### Group Membership 224 | 225 | Not a problem specific to the module, and more a FreeRADIUS gotcha, an administrator will find themselves authenticating devices using the `inner-tunnel` virtual service but require the `OAuth2-Group` attributes to be present on the (outer) `default` virtual server to assign VLANs or `Filter-Id`. 226 | 227 | This is best done by adding the following to the `post-auth` section of your `inner-tunnel` virtual server: 228 | 229 | post-auth { 230 | ... 231 | 232 | update outer.request { 233 | &OAuth2-Group := &OAuth2-Group[*] 234 | } 235 | 236 | .... 237 | } 238 | 239 | Then from the `post-auth` section of your (outer) `default` virtual server you should find the `OAuth2-Group` attributes are accessible. 240 | 241 | # Troubleshooting 242 | 243 | After a restart, you should be able to do an authentication against the server using `radtest`: 244 | 245 | radtest USERNAME@example.com PASSWORD 127.0.0.1 0 testing123 246 | 247 | Please note that due to limitations in FreeRADIUS and around `rlm_perl`: 248 | 249 | * the first request against a realm/domain will be *very* slow 250 | * it may be so slow that the request will fail due to timing out 251 | * please retry as depending on how large your realm/domain it may only start to work on the second or third try 252 | * it takes time to download a list of all your users and their group memberships 253 | * after this initial synchronisation, further updates are handled in the background and will not impact future requests 254 | * it is *strongly* recommended as part of the process of restarting FreeRADIUS is to afterwards loop using `radtest` (or `eapol_test` described below) until authentication succeeds to preload and warmup the user and group replication: 255 | 256 | while ! radtest ...; do sleep 0.1; done 257 | 258 | If your authentication fails, then you may see some `Reply-Message` attributes from Azure if there is a problem with the account. If there is no `Reply-Message` then your next step is to stop FreeRADIUS and run it in debugging mode: 259 | 260 | sudo systemctl stop freeradius 261 | sudo freeradius -X 262 | 263 | Now from another terminal re-run `radtest` and in the debugging output from FreeRADIUS should be clues to the underlying problem. 264 | 265 | Whilst FreeRADIUS is in debugging mode, you can monitor the database replication by looking for (this may be interleaved with other debug output so do use `grep 'oauth2 worker'`): 266 | 267 | rlm_perl: oauth2 worker (example.com): sync <-- process starts 268 | rlm_perl: oauth2 worker (example.com): sync users <-- starting fetch of users 269 | rlm_perl: oauth2 worker (example.com): users page <-- page of user results (initial sync has lots of these!) 270 | rlm_perl: oauth2 worker (example.com): sync groups <-- starting fetch of group memberships 271 | rlm_perl: oauth2 worker (example.com): groups page <-- page of group results (initial sync has lots of these!) 272 | rlm_perl: oauth2 worker (example.com): apply <-- process complete new data made live 273 | rlm_perl: oauth2 worker (example.com): syncing in 32 seconds <-- next sync ('ttl' scheduled with 33% fuzz) 274 | 275 | ## HTTPS Requests 276 | 277 | If you edit [`module`](./module) and set `debug = yes` for the configuration for the Perl `oauth2_perl` section, the debugging output will also include the plaintext HTTP requests and responses between the module and Azure; the output includes passwords and credential tokens used. 278 | 279 | **N.B.** do not leave this enabled in production! 280 | 281 | ## 802.1X 282 | 283 | **N.B.** do not try to debug an 802.1X authentication until *after* you have managed to get the much simpler `radtest` to work for you 284 | 285 | You will require a copy of [`eapol_test`](http://deployingradius.com/scripts/eapol_test/) which to build from source on your target RADIUS server you type: 286 | 287 | sudo apt-get -y install --no-install-recommends build-essential git libdbus-1-dev libnl-3-dev libnl-genl-3-dev libnl-route-3-dev libssl-dev pkg-config 288 | git clone git://w1.fi/hostap.git 289 | cd hostap 290 | sed -e 's/^#CONFIG_EAPOL_TEST=y/CONFIG_EAPOL_TEST=y/' wpa_supplicant/defconfig > wpa_supplicant/.config 291 | make -C wpa_supplicant -j$(($(getconf _NPROCESSORS_ONLN)+1)) eapol_test 292 | 293 | Once built, you will need a configuration file (amending `USERNAME`, `PASSWORD` and `example.com`): 294 | 295 | cat <<'EOF' > eapol_test.conf 296 | network={ 297 | key_mgmt=IEEE8021X 298 | eap=TTLS 299 | anonymous_identity="@example.com" 300 | identity="USERNAME@example.com" 301 | password="PASSWORD" 302 | phase2="auth=PAP" 303 | } 304 | EOF 305 | 306 | **N.B.** do not use this configuration on your clients without adding [certificate validation options such as `ca_path` and `domain_match`](https://w1.fi/cgit/hostap/plain/wpa_supplicant/wpa_supplicant.conf) 307 | 308 | To test it works run: 309 | 310 | $ ./wpa_supplicant/eapol_test -s testing123 -c eapol_test.conf 311 | 312 | A successful test will have again an `Access-Accept` towards the end of the output: 313 | 314 | Received RADIUS message 315 | RADIUS message: code=2 (Access-Accept) identifier=6 length=174 316 | Attribute 26 (Vendor-Specific) length=58 317 | Value: 00000137113...df32a90a69 318 | Attribute 26 (Vendor-Specific) length=58 319 | Value: 00000137103...59ae28081b 320 | Attribute 79 (EAP-Message) length=6 321 | Value: 036a0004 322 | Attribute 80 (Message-Authenticator) length=18 323 | Value: 3c4829e4901baac9bb9880acfd69feab 324 | Attribute 1 (User-Name) length=14 325 | Value: '@example.com' 326 | STA 02:00:00:00:00:01: Received RADIUS packet matched with a pending request, round trip time 0.02 sec 327 | 328 | **N.B.** in the case of a failure you will *not* get a set of `Reply-Message` attributes in the `Access-Reject` as [EAP does not allow this](https://tools.ietf.org/html/rfc3579#section-2.6.5) 329 | -------------------------------------------------------------------------------- /README.rlm_rest.md: -------------------------------------------------------------------------------- 1 | A good question is why not to use [`rlm_rest`](https://freeradius.org/modules/?cat=io&mod=rlm_rest) and [`rlm_cache`](https://freeradius.org/modules/?s=cache&mod=rlm_cache) stitched together with [unlang](https://freeradius.org/radiusd/man/unlang.html). 2 | 3 | FreeRADIUS makes working with a REST API really difficult for the following (undocumented) reasons: 4 | 5 | * does not support parse nested objects 6 | * user/group is nested as `.value[].{userPrincipalName,displayName}` 7 | * cannot be flatten by the [Microsoft Graph API](https://docs.microsoft.com/en-us/graph/use-the-api) 8 | * URI handling is...peculiar 9 | * validation of the URL is done *before* `xlat` and as `://` cannot be found it is considered invalid 10 | * host/path components are treated differently 11 | * every `xlat` evaluation in the path is URL encoded unconditionally 12 | * as such if you have an attribute that contains a correctly formed query string (or URI) it breaks it 13 | * such URLs can be found in the OAuth2 Discovery document and... 14 | * does not make the HTTP headers of the response available 15 | * parsing [`Cache-Control`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control) headers is impossible 16 | * makes supporting paging impossible 17 | * we need to use the [full URL](https://docs.microsoft.com/en-us/graph/paging) from the response to walk through pages, unfortunately the unconditional escaping of `xlat`'s make this not possible 18 | 19 | As such, this is implemented using [`rlm_perl`](https://freeradius.org/modules/?s=perl&mod=rlm_perl) to maintain accessibility to others. 20 | -------------------------------------------------------------------------------- /dictionary: -------------------------------------------------------------------------------- 1 | ATTRIBUTE OAuth2-Password-Last-Modified 3000 date 2 | ATTRIBUTE OAuth2-Group 3001 string 3 | -------------------------------------------------------------------------------- /main.pm: -------------------------------------------------------------------------------- 1 | use strict; 2 | use warnings; 3 | 4 | use threads; 5 | use threads::shared; 6 | 7 | use HTTP::Status qw/is_client_error is_server_error/; 8 | use JSON::PP; 9 | use List::Util qw/reduce/; 10 | use LWP::UserAgent; 11 | use LWP::ConnCache; 12 | use POSIX qw(setlocale LC_ALL); 13 | use Time::Piece; 14 | 15 | use Data::Dumper; 16 | 17 | # https://wiki.freeradius.org/modules/Rlm_perl#logging is wrong... 18 | use constant { 19 | L_AUTH => 2, 20 | L_INFO => 3, 21 | L_ERR => 4, 22 | L_WARN => 5, 23 | L_PROXY => 6, 24 | L_ACCT => 7, 25 | L_DBG => 16, 26 | }; 27 | 28 | # https://wiki.freeradius.org/modules/Rlm_perl#return-codes 29 | use constant { 30 | RLM_MODULE_REJECT => 0, # immediately reject the request 31 | RLM_MODULE_FAIL => 1, # module failed, don't reply 32 | RLM_MODULE_OK => 2, # the module is OK, continue 33 | RLM_MODULE_HANDLED => 3, # the module handled the request, so stop 34 | RLM_MODULE_INVALID => 4, # the module considers the request invalid 35 | RLM_MODULE_USERLOCK => 5, # reject the request (user is locked out) 36 | RLM_MODULE_NOTFOUND => 6, # user not found 37 | RLM_MODULE_NOOP => 7, # module succeeded without doing anything 38 | RLM_MODULE_UPDATED => 8, # OK (pairs modified) 39 | RLM_MODULE_NUMCODES => 9, # How many return codes there are 40 | }; 41 | 42 | use vars qw/%RAD_PERLCONF %RAD_REQUEST %RAD_REPLY %RAD_CHECK/; 43 | 44 | my @sups; 45 | my %realms :shared; 46 | 47 | # https://github.com/jimdigriz/freeradius-oauth2-perl/issues/13#issuecomment-728279207 48 | $ENV{LC_ALL} = 'C' unless (defined($ENV{LC_ALL})); 49 | 50 | # it would be nice to catch SIGHUP in the main thread to signal a refresh of 51 | # the user/group lists but rlm_perl masks out the signal so we cannot 52 | 53 | # BEGIN is run before anything starts so it would have been a good place 54 | # to do initialising...but %RAD_PERLCONF is not yet populated so we cannot 55 | #BEGIN { 56 | # radiusd::radlog(L_DBG, 'oauth2 begin'); 57 | #} 58 | 59 | # Fortunately, main calls seem to also run as a singleton before anything 60 | # starts and %RAD_PERLCONF works, but we are unable to as for config{}: 61 | # * "realm = ${realm}" does not work, looks to miss the realm keys or overwrites everything to 'realm' 62 | # * "example.com = ${realm[example.com].oauth2}" produces an off-by-one with an extra empty string key 63 | # * using "example.com = { oauth2 = ${realm[example.com].oauth2} }" sort of works but throws a warning 64 | # * this does though make configuration harder for the end user 65 | radiusd::radlog(L_DBG, 'oauth2 global'); 66 | #radiusd::radlog(L_DBG, 'oauth2 global: ' . Dumper \%RAD_PERLCONF); 67 | 68 | # ...instead we opt for runtime checking: 69 | # * %{config:...} throws a scary but ignorable ERROR if the key does not exist 70 | # * we have to live with not being able to pre-populate before the first request 71 | # * besides xlat does not work in global so %{config:...} is not accessible here 72 | 73 | my $ua = LWP::UserAgent->new; 74 | $ua->timeout(10); 75 | $ua->env_proxy; 76 | $ua->agent("freeradius-oauth2-perl/0.2 (+https://github.com/jimdigriz/freeradius-oauth2-perl; ${\$ua->_agent})"); 77 | $ua->conn_cache(LWP::ConnCache->new); 78 | $ua->default_header('Accept-Encoding' => scalar HTTP::Message::decodable()); 79 | if (defined($RAD_PERLCONF{debug}) && $RAD_PERLCONF{debug} =~ /^(?:1|true|yes)$/i) { 80 | radiusd::radlog(L_INFO, 'debugging enabled, you will see the HTTPS requests in the clear!'); 81 | 82 | sub handler { 83 | my $r = $_[0]->clone; 84 | $r->decode; 85 | radiusd::radlog(L_DBG, $_) 86 | foreach split /\n/, $r->dump; 87 | } 88 | 89 | $ua->add_handler('request_send', \&handler); 90 | $ua->add_handler('response_done', \&handler); 91 | } 92 | 93 | # %{date:...} does not work :( 94 | if ($^V ge v5.28) { 95 | Time::Piece->use_locale(); 96 | } else { 97 | warn "old version of Perl (pre-5.28) detected, non-English locale users must run FreeRADIUS with LC_ALL=C"; 98 | } 99 | use constant RADTIME_FMT => '%b %e %Y %H:%M:%S %Z'; 100 | sub to_radtime { 101 | my ($s) = @_; 102 | return Time::Piece->strptime($s, '%Y-%m-%dT%H:%M:%SZ')->strftime(RADTIME_FMT); 103 | } 104 | sub worker { 105 | my $thr; 106 | my $running = 1; 107 | $SIG{'HUP'} = sub { print STDERR "worker supervisor SIGHUP\n"; $thr->kill('TERM') if (defined($thr)); }; 108 | $SIG{'TERM'} = sub { print STDERR "worker supervisor SIGTERM\n"; $running = 0; $thr->kill('TERM') if (defined($thr)); }; 109 | 110 | setlocale(LC_ALL, $ENV{LC_ALL}); 111 | 112 | our ($realm, $discovery_uri, $client_id, $client_secret) = @_; 113 | our $ttl = int($RAD_PERLCONF{ttl} || 30); 114 | $ttl = 10 if ($ttl < 10); 115 | 116 | radiusd::radlog(L_DBG, "oauth2 worker ($realm): supervisor started (tid=${\threads->tid()})"); 117 | 118 | radiusd::radlog(L_DBG, "oauth2 worker ($realm): fetching discovery document"); 119 | 120 | my $r = $ua->get("${discovery_uri}/.well-known/openid-configuration"); 121 | unless ($r->is_success) { 122 | radiusd::radlog(L_ERR, "oauth2 worker ($realm): discovery failed: ${\$r->status_line}"); 123 | die "discovery ($realm): ${\$r->status_line}"; # no cond_signal so we deadlock! 124 | } 125 | our $discovery = decode_json $r->decoded_content; 126 | 127 | my $pacing = 0; 128 | while (1) { 129 | $thr = async { 130 | my $running = 1; 131 | $SIG{'TERM'} = sub { print STDERR "worker SIGTERM\n"; $running = 0; }; 132 | 133 | setlocale(LC_ALL, $ENV{LC_ALL}); 134 | 135 | radiusd::radlog(L_DBG, "oauth2 worker ($realm): started (tid=${\threads->tid()})"); 136 | 137 | our ($authorization_var, $authorization_ttl); 138 | sub authorization { 139 | return $authorization_var if (defined($authorization_var) && $authorization_ttl > time()); 140 | 141 | radiusd::radlog(L_DBG, "oauth2 worker ($realm): fetching token"); 142 | 143 | my $r = $ua->post($discovery->{token_endpoint}, [ 144 | client_id => $client_id, 145 | client_secret => $client_secret, 146 | scope => 'https://graph.microsoft.com/.default', 147 | grant_type => 'client_credentials' 148 | ]); 149 | unless ($r->is_success) { 150 | radiusd::radlog(L_ERR, "oauth2 worker ($realm): token failed: ${\$r->status_line}"); 151 | die "token ($realm): ${\$r->status_line}" if (is_server_error($r->code)); 152 | return; 153 | } 154 | 155 | my $token = decode_json $r->decoded_content; 156 | 157 | $authorization_var = "${\$token->{token_type}} ${\$token->{access_token}}"; 158 | $authorization_ttl = time() + $token->{expires_in}; 159 | 160 | return $authorization_var; 161 | } 162 | 163 | sub fetch { 164 | my ($purpose, $uri) = @_; 165 | 166 | my $r = $ua->get($uri, Authorization => &authorization(), Prefer => 'return=minimal', Accept => 'application/json'); 167 | unless ($r->is_success) { 168 | if ($r->code == HTTP::Status::HTTP_UNAUTHORIZED) { 169 | $authorization_var = undef; 170 | return &fetch($purpose, $uri); 171 | } elsif ($r->code == HTTP::Status::HTTP_TOO_MANY_REQUESTS) { 172 | my $sleep = (int($r->header('Retry-After')) || 10) + 1; 173 | radiusd::radlog(L_WARN, "oauth2 worker ($realm): $purpose throttled, sleeping for $sleep seconds"); 174 | sleep($sleep); 175 | return &fetch($purpose, $uri); 176 | } 177 | 178 | radiusd::radlog(L_WARN, "oauth2 worker ($realm): $purpose failed: ${\$r->status_line}"); 179 | die "token ($realm): ${\$r->status_line}" if (is_server_error($r->code)); 180 | 181 | return; 182 | } 183 | 184 | return decode_json $r->decoded_content; 185 | } 186 | 187 | sub walk { 188 | my ($purpose, $uri, $callback) = @_; 189 | 190 | my $delta; 191 | while (defined($uri)) { 192 | radiusd::radlog(L_DBG, "oauth2 worker ($realm): $purpose page"); 193 | 194 | my $data = &fetch($purpose, $uri); 195 | 196 | &$callback($data->{value}); 197 | 198 | $delta = $data->{'@odata.deltaLink'}; 199 | $uri = $data->{'@odata.nextLink'}; 200 | } 201 | 202 | return $delta; 203 | } 204 | 205 | # delta queries can be seen as a database replication stream so we have to retain everything 206 | # unless explictly told that it can be deleted via @remove->reason->'deleted' 207 | my (%users, %groups); 208 | my $usersUri = 'https://graph.microsoft.com/v1.0/users/delta?$select=id,userPrincipalName,isResourceAccount,accountEnabled,lastPasswordChangeDateTime'; 209 | my $groupsUri = 'https://graph.microsoft.com/v1.0/groups/delta?$select=id,displayName,members'; 210 | while ($running) { 211 | radiusd::radlog(L_INFO, "oauth2 worker ($realm): sync"); 212 | 213 | radiusd::radlog(L_DBG, "oauth2 worker ($realm): sync users"); 214 | $usersUri = &walk('users', $usersUri, sub { 215 | my ($data) = @_; 216 | 217 | # print STDERR Dumper $data; 218 | 219 | foreach my $d (grep { ($_->{isResourceAccount} || JSON::PP::false) != JSON::PP::true } @$data) { 220 | my $id = $d->{id}; 221 | if (exists($d->{'@removed'}) && $d->{'@removed'}{reason} eq 'deleted') { 222 | delete $users{$id}; 223 | } else { 224 | my $r = exists($users{$id}) ? $users{$id} : shared_clone({}); 225 | $users{$id} = $r; 226 | $r->{R} = exists($d->{'@removed'}); 227 | $r->{n} = $d->{userPrincipalName} if (exists($d->{userPrincipalName})); 228 | $r->{e} = $d->{accountEnabled} == JSON::PP::true if (exists($d->{accountEnabled})); 229 | $r->{p} = to_radtime($d->{lastPasswordChangeDateTime}) if (exists($d->{lastPasswordChangeDateTime})); 230 | } 231 | } 232 | }); 233 | 234 | radiusd::radlog(L_DBG, "oauth2 worker ($realm): sync groups"); 235 | $groupsUri = &walk('groups', $groupsUri, sub { 236 | my ($data) = @_; 237 | 238 | # print STDERR Dumper $data; 239 | 240 | foreach my $d (@$data) { 241 | my $id = $d->{id}; 242 | if (exists($d->{'@removed'}) && $d->{'@removed'}{reason} eq 'deleted') { 243 | delete $groups{$id}; 244 | } else { 245 | unless (exists($groups{$id})) { 246 | $groups{$id} = shared_clone({}); 247 | $groups{$id}->{m} = shared_clone({}); 248 | } 249 | my $r = $groups{$id}; 250 | $r->{R} = exists($d->{'@removed'}); 251 | $r->{n} = $d->{displayName} if (exists($d->{displayName})); 252 | foreach (@{$d->{'members@delta'}}) { 253 | if (exists($_->{'@removed'})) { # always 'deleted' 254 | delete $r->{m}->{$_->{id}}; 255 | } else { 256 | $r->{m}->{$_->{id}} = undef; 257 | } 258 | } 259 | } 260 | } 261 | }); 262 | 263 | # print STDERR Dumper \%users; 264 | # print STDERR Dumper \%groups; 265 | 266 | radiusd::radlog(L_DBG, "oauth2 worker ($realm): apply"); 267 | my %db :shared; 268 | $db{t} = $discovery->{token_endpoint}; 269 | $db{u} = shared_clone({}); 270 | $db{u}{lc $users{$_}->{n}} = $users{$_}->{p} 271 | foreach grep { !$users{$_}->{R} && $users{$_}->{e} } keys %users; 272 | $db{g} = shared_clone({}); 273 | foreach (grep { !$groups{$_}->{R} } keys %groups) { 274 | my @m = map { lc $users{$_}->{n} } grep { $users{$_}->{e} } keys %{$groups{$_}->{m}}; 275 | $db{g}->{$groups{$_}->{n}} = shared_clone({ map { $_, undef } @m }) 276 | if (scalar @m); 277 | } 278 | 279 | { 280 | lock(%{$realms{$realm}}); 281 | %{$realms{$realm}} = %db; 282 | cond_signal(%{$realms{$realm}}); 283 | } 284 | 285 | # successful run means we can reset the pacer 286 | $pacing = 0; 287 | 288 | my $sleep = int($ttl - ($ttl / 3) + rand(2 * $ttl / 3)); 289 | radiusd::radlog(L_INFO, "oauth2 worker ($realm): syncing in $sleep seconds"); 290 | sleep($sleep); 291 | } 292 | }; 293 | 294 | $thr->join(); 295 | $thr = undef; 296 | 297 | last unless ($running); 298 | 299 | my $sleep = $pacing ** 2; 300 | radiusd::radlog(L_WARN, "oauth2 worker ($realm): died, sleeping for $sleep seconds"); 301 | sleep($sleep); 302 | $pacing++ if ($pacing < 10); 303 | } 304 | } 305 | 306 | sub authorize { 307 | radiusd::radlog(L_DBG, 'oauth2 authorize'); 308 | 309 | my $username = $RAD_REQUEST{'User-Name'}; 310 | my $realm = $RAD_REQUEST{'Realm'}; 311 | return RLM_MODULE_INVALID unless (defined($username) && defined($realm)); 312 | 313 | { 314 | lock(%realms); 315 | unless (exists($realms{$realm})) { 316 | # discovery has already been checked that it exists in policy 317 | # * %{xlat:...} does not work :( 318 | my $discovery_uri = radiusd::xlat(radiusd::xlat("%{config:realm[$realm].oauth2.discovery}")); 319 | 320 | # these should exist, if they do not...explode 321 | my $client_id = radiusd::xlat("%{config:realm[$realm].oauth2.client_id}"); 322 | my $client_secret = radiusd::xlat("%{config:realm[$realm].oauth2.client_secret}"); 323 | return RLM_MODULE_FAIL if ($client_id eq '' || $client_secret eq ''); 324 | 325 | $realms{$realm} = shared_clone({}); 326 | lock(%{$realms{$realm}}); 327 | push @sups, threads->create(\&worker, $realm, $discovery_uri, $client_id, $client_secret); 328 | cond_wait(%{$realms{$realm}}); 329 | } 330 | } 331 | 332 | my $state; 333 | { 334 | lock(%{$realms{$realm}}); 335 | $state = $realms{$realm}; 336 | } 337 | # print STDERR Dumper $state; 338 | 339 | return RLM_MODULE_NOTFOUND unless (exists($state->{u}{lc $username})); 340 | 341 | $RAD_REQUEST{'OAuth2-Group'} = reduce { push @$a, $b if (exists($state->{g}{$b}{lc $username})); $a; } [], keys %{$state->{g}}; 342 | 343 | # technically should be done in authenticate, but we do it here as it would 344 | # create a race if the user was to update their password beteen here and there 345 | $RAD_CHECK{'OAuth2-Password-Last-Modified'} = $state->{u}{lc $username}; 346 | 347 | $RAD_CHECK{'Auth-Type'} = 'oauth2'; 348 | 349 | #$_->kill('HUP')->join() foreach @sups; 350 | 351 | return RLM_MODULE_UPDATED; 352 | } 353 | 354 | sub authenticate { 355 | radiusd::radlog(L_DBG, 'oauth2 authenticate'); 356 | 357 | my $username = $RAD_REQUEST{'User-Name'}; 358 | my $realm = $RAD_REQUEST{'Realm'}; 359 | 360 | my $state; 361 | { 362 | lock(%{$realms{$realm}}); 363 | $state = $realms{$realm}; 364 | } 365 | my $client_id = radiusd::xlat("%{config:realm[$realm].oauth2.client_id}"); 366 | my $client_secret = radiusd::xlat("%{config:realm[$realm].oauth2.client_secret}"); 367 | 368 | radiusd::radlog(L_INFO, "oauth2 token"); 369 | 370 | # $state->{t} is static so no race 371 | my $r = $ua->post($state->{t}, [ 372 | client_id => $client_id, 373 | client_secret => $client_secret, 374 | scope => 'openid email', 375 | grant_type => 'password', 376 | username => $username, 377 | password => $RAD_REQUEST{'User-Password'} 378 | ]); 379 | unless ($r->is_success) { 380 | radiusd::radlog(L_ERR, "oauth2 token failed: ${\$r->status_line}"); 381 | return RLM_MODULE_FAIL if (is_server_error($r->code)); 382 | my $response = decode_json $r->decoded_content; 383 | my @e = ( 'Error: ' . $response->{'error'} ); 384 | push @e, split /\r\n/ms, $response->{'error_description'} 385 | if (defined($response->{'error_description'})); 386 | $RAD_REPLY{'Reply-Message'} = \@e; 387 | return RLM_MODULE_REJECT; 388 | } 389 | 390 | # print STDERR Dumper decode_json $r->decoded_content; 391 | 392 | return RLM_MODULE_OK; 393 | } 394 | 395 | sub detach { 396 | radiusd::radlog(L_DBG, 'oauth2 detach'); 397 | 398 | # ...does not work 399 | #$_->kill('TERM')->join() foreach @sups; 400 | } 401 | -------------------------------------------------------------------------------- /module: -------------------------------------------------------------------------------- 1 | # rlm_rest is really lacking (see README.rlm_rest.md) so we use rlm_perl 2 | 3 | perl oauth2_perl { 4 | filename = /opt/freeradius-oauth2-perl/main.pm 5 | 6 | config { 7 | #ttl = 30 # default 30s (>10s as cloud is slow) - 33% fuzzing is applied 8 | #debug = yes # default no 9 | } 10 | } 11 | 12 | cache oauth2_cache { 13 | key = "%{User-Name}" 14 | 15 | ttl = 864000 # 10 days 16 | 17 | update { 18 | &request:OAuth2-Password-Last-Modified := &control:OAuth2-Password-Last-Modified 19 | &control:Password-With-Header := &control:Password-With-Header 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /policy: -------------------------------------------------------------------------------- 1 | oauth2.authorize { 2 | # for non-oauth2 handled domains you will see and should ignore 3 | # ERRROR: "Config item "realm[...].oauth2.discovery" does not exist" 4 | if (&Realm && &User-Password && "%{config:realm[%{Realm}].oauth2.discovery}") { 5 | oauth2_perl 6 | if (updated && "%{config:realm[%{Realm}].oauth2.cache_password}" =~ /^(yes)?$/i) { 7 | update control { 8 | &Cache-Read-Only = yes 9 | } 10 | oauth2_cache 11 | # outsource the authentication to PAP if we have valid cached credentials 12 | if (ok && "%{request:OAuth2-Password-Last-Modified}" == "%{control:OAuth2-Password-Last-Modified}") { 13 | update control { 14 | Auth-Type -= "oauth2" 15 | } 16 | } 17 | } 18 | } else { 19 | noop 20 | } 21 | } 22 | 23 | oauth2.authenticate { 24 | oauth2_perl 25 | } 26 | 27 | oauth2.post-auth { 28 | if ("%{config:realm[%{Realm}].oauth2.cache_password}" =~ /^(yes)?$/i) { 29 | if (&control:Auth-Type == "oauth2") { 30 | update request { 31 | &Tmp-String-0 = "%{randstr:32.}" 32 | } 33 | update control { 34 | &Password-With-Header = "{ssha512}%{sha512:%{&User-Password}%{&Tmp-String-0}}%{hex:&Tmp-String-0}" 35 | } 36 | } 37 | if (&control:OAuth2-Password-Last-Modified) { 38 | oauth2_cache 39 | } 40 | } 41 | } 42 | --------------------------------------------------------------------------------